Industrial Fastener Manufacturer & Stockist

Blakeacre Products Include:

• Capacitor Discharge Studs
• Weld Bolts
• Bolt Lok™
• Self Clinching Studs
• Thread Forming Screws
• PCB Circuit Board Screws
• Multi Grip Pins
• Specials
• Solid Rivets
• Machine Screws
• Cup Square Bolts
• Spline Bolts
• Silo Bolts

Useful Information

Manufacturers and Stockist of a wide range of Industrial Fasteners, Fastening Systems and Components throughout the U.K. and Europe.

As manufacturers we have lots of general useful information which you may find helpful in your product selection or design. Some of the less esoteric are listed below.

• Mechanical Properties ISO.898

STRENGTH GRADE DESIGNATION		TENSILE RANGE N/mm2	HARDNESS HB	HARDNESS HV	HARDNESS ROCKWELL B	HARDNESS ROCKWELL C
4.6	Min	400	114	120	67	-
	Max	-	238	250	99.5	-
4.8	Min	420	124	130	71	-
	Max	-	238	250	99.5	-
5.6	Min	500	147	155	79	-
	Max	-	238	250	99.5	-
5.8	Min	520	152	160	82	-
	Max	-	238	250	99.5	-
6.8	Min	600	181	190	89	-
	Max	-	238	250	99.5	-
8.8<16 mm Dia	Min	800	238	250	-	22
	Max	-	304	320	-	32
8.8>16 mm Dia	Min	830	242	255	-	23
	Max	-	318	335	-	34
9.8	Min	900	276	290	-	28
	Max	-	342	360	-	37
10.9	Min	1040	304	320	-	32
	Max	-	361	380	-	39
12.9	Min	1220	366	385	-	39
	Max	-	414	435	-	44



• Mechanical Properties BS.3692
(This standard is now obsolete)
STRENGTH GRADE DESIGNATION		TENSILE RANGE Kg/ mm2	TENSILE RANGE Tons/ Sq in	TENSILE RANGE N/ mm2	HARD- NESS HB	HARD- NESS HV	HARD-NESS ROCKWELL B	HARD-NESS ROCKWELL C
4.6-4.8	Min	40	25.40	392	110	110	62	-
	Max	55	34.90	539	170	170	68	-
5.6-5.8	Min	50	31.75	490	140	140	77	-
	Max	70	44.45	686	215	215	97	-
6.6-6.8	Min	60	38.10	588	170	170	88	-
	Max	80	50.80	785	245	245	102	-
8.8	Min	80	50.80	785	225	225	-	18
	Max	100	63.50	981	300	300	-	31
10.9	Min	100	63.50	981	280	280	-	27
	Max	120	76.20	1177	365	370	-	38
12.9	Min	120	76.20	1177	330	330	-	34
	Max	140	88.90	1373	425	440	-	44
14.9	Min	140	88.90	1373	390	400	-	40
	Max	160	101.00	1569	-	510	-	49


• Useful Conversions

To Convert	Into	Multiply by
Centimetres	Feet	0.032808
	Inches	0.39370
Cubic feet	Cubic metres	0.028317
Degrees Celsius (centigrade)	Degrees Farenheight	1.8 & add 32
Degrees Farenheight	Degrees Celsius (centigrade)	(Deg F -32) x 0.556
Feet	Centimetres	30.48
	Metres	0.3048
Foot pounds-force	Kilogramme-force metres	0.13825+
Inches	Centimetres	2.54
	Metres	0.0254
	Millimetres	25.4
Kilogrammes	Hundredweights	0.019684
	Ounces	2.2046
	Pounds	35.274
	Short Tons	0.0011023
	Tons	0.00098421
Kilogrammes per metre	pounds per foot	0.67197
	pounds per inch	03055997
Kilogrammes per square metre	Pounds per square foot	0.20482
	Pounds per square yard	0.18433
Kilogrammes-force (kiloponds)	Newtons	9.80665
	Pounds-force	2.2046
Kilogramme-force metres (Torque)	Newton metres	9.80665
	Pound-force feet	7.2330
Kilogrammes-force/sq. centimetre	Meganewtons per square metre	0.0980665
	Pounds-force per square inch	14.223
Kilogrammes-force/sq. millimetre	Meganewtons per square metre	9.80665
	Pounds-force per square inch	1422.3
	Tons-force per square inch	0.63497
Kilonewtons per square metre	Pounds-force per square foot	20.885+
	Pounds-force per square inch	0.14504
Meganewtons per square metre	Kilogrammes-force per sq. centimetre	10.197
	Kilogrammes-force per sq. millimetre	0.10197
	Pounds force per square inch	145.04
	Tonnes-force per square centimetre	0.010197
	Tons-force per square inch	0.064749
Millimetres	Inches	0.039370
Newtons	Kilogrammes-force (kiloponds)	0.10197
	Pounds-force	0.22481
Newton metres	Kilogramme-force metres (torque)	0.10197
	Pound-force feet	0.73756
Newtons per square metre	Kilogrammes-force per sq. metre	0.10197
	Pounds-force per square foot	0.020885+
Pound-force feet	Kilogramme-force (metres) (torque) Newton (metres)	0.13825+ 1.3558
Square centimetres	Square (inches)	0.15500+
Square feet	Square (metres)	0.092903
Square inches	Square (cm) Square (mm)	6.4516 645.16
Square millimetres	Square (inches)	0.0015500+



• ISO Metric Thread Sizes BS.3643

6g = Before Plating / 4h = After Plating

Nominal Diameter	Pitch	Tolerance Class	Major Diameter		Pitch Diameter		Minor Diameter Min
			Max	Min	Max	Min
M3	0.5	6g	2.980	2.874	2.655	2.580	2.272
		4h	3.000	2.933	2.675	2.627	2.319
M4	0.7	6g	3.978	3.838	3.523	3.433	3.002
		4h	4.000	3.910	3.545	3.489	3.058
M5	0.8	6g	4.976	4.826	4.456	4.361	3.868
		4h	5.000	4.905	4.480	4.420	3.927
M6	1.0	6g	5.974	5.794	5.324	5.212	4.597
		4h	6.000	5.888	5.350	5.279	4.663
M8	1.25	6g	7.972	7.760	7.160	7.042	6.272
		4h	8.000	7.868	7.188	7.113	6.343
M10	1.5	6g	9.968	9.732	8.994	8.862	7.938
		4h	10.000	9.850	9.026	8.941	8.018
M12	1.75	6g	11.966	11.701	10.829	10.679	9.602
		4h	12.000	11.830	10.863	10.768	9.692
M16	2.0	6g	15.962	15.682	14.663	14.503	13.271
		4h	16.000	15.820	14.701	14.601	13.369


•  Recommended Tightening Torque - Metric and Imperial threads
• Tensile Stress Area of bolt - Imperial & Metric Threads

Imperial Threads


Nominal Thread Diameter
	BSW		BSF		UNC		UNF
	TPI	in2	TPI	in2	TPI	in2	TPI	in2
1/4	20	0.0320	26	0.0356	20	0.0324	28	0.0368
5/16	18	0.0527	22	0.0567	18	0.0532	24	0.0587
3/8	16	0.0779	20	0.0839	16	0.0786	24	0.0886
7/16	14	0.1069	18	0.1158	14	0.1078	20	0.1198
1/2	12	0.1385	16	0.1520	13	0.1438	20	0.1612
9/16	12	0.0183	16	0.1980	12	0.184	18	0.205
5/8	11	0.2270	14	0.2430	11	0.229	18	0.258
3/4	10	0.3360	12	0.3520	10	0.338	16	0.375
7/8	9	0.4630	11	0.4870	9	0.467	14	0.513
1	8	0.6080	10	0.6420	8	0.612	12	0.667


Metric Threads


Nominal Thread Diameter	Metric Threads
	Course Pitch		Fine Pitch
	TPI	mm2	TPI	mm2
M3	0.5	5.03	0.35
M4	0.7	8.78	0.5
M5	0.8	14.2	0.5
M6	1.0	20.1	0.75	22.0
M8	1.25	36.6	1.0	39.2
M10	1.50	58.0	1.25	61.2
M12	1.75	84.3	1.25	92.1
M14	2.0	115	1.5	125.0
M16	2.0	157	1.5	167.0
M18	2.5	192	1.5

If you require further specific information, please contact us and we will try to be of assistance.